最新大庆中考数学试题及答案+qsgwsx优秀名师资料.doc

2011大庆中考数学试题及答案 qsgwsx2011年大庆市初中升学统一考试 数 学 试 题 考生注意: 1. 考生须将自己的姓名、准考证号、座位号填写到试卷和答案卡规定的位置。 2. 萨尔图、龙凤、让胡路、红岗、大同区考生在答题卡上作答。 3. 林甸、杜蒙、肇州、肇源县考生在试卷上作答。 4. 考试时间120分钟。 5. 全卷共三道大题，28个小题，总分120分。 一、选择题(本大题共10小题，每小题3分，共30分。在每小题给出的四个选项中，只有一项是符合题目要求的，请将正确选项的序号填涂在答题卡上) 11,与互为倒数的是 ( ) 211A.-2 B,- C, D,2 22-52?用科学记数法表示数5.8×10,它应该等于 ( ) ,0.000 58 C.0.000 058 D,0.O00 005 8 A.0.005 8 B3,对任意实数a,则下列等式一定成立的是 ( ) 2222a,aA,a,a B,a,a C,a,a D, l4?若一个圆锥的侧面积是10,则下列图象中表示这个圆锥母线与底面半径r之间的函数关l l l l O r O r O r O r A B C D (第4题) 系的是 ( ) 5若a+b>0，且b<0，贝a，b，-a，-b的大小关系为 ( ) A.-a<-b<b<a B(-a<b<-b<a C. -a<b<a<-b D(b<-a<-b<a 6某商场为促销开展抽奖活动，让顾客转动一次转盘，当转盘停止后，只有指针指向阴影区域时，顾客才能获得奖品，下列有四个大小相同的转盘可供选择，使顾客获得奖品可能appearance of the weld appearance quality technical requirements of the project must not have a molten metal stream does not melt the base metal to weld, weld seam and heat-affected zone surface must not have cracks, pores, defects such as crater and ash, surface smoothing, weld and base metal should be evenly smooth transition. Width 2-3 mm from the edge of weld Groove. Surface reinforcement should be less than or equal to 1 + 0.2 times the slope edge width, and should not be greater than 4 mm. Depth of undercut should be less than or equal to 0.5 mm, total length of the welds on both sides undercut not exceed 10% of the weld length, and long continuous should not be greater than 100 mm. Wrong side should be less than or at 0.2T, and should not be greater than 2 mm (wall thickness mm t) incomplete or not allow 7.5 7.5.1 installation quality process standards of the electrical enclosure Cabinet surface is clean, neat, no significant phenomenon of convex, close to nature, close the door. 7.5.2 Cabinet Cabinet face paints no paint, returned to rusted, consistent color. 7.5.3 uniform indirect gap from top to bottom, slot width <1.5mm 7.5.4 adjacent Cabinet surface roughness is 0. 7.5.5 the cabinets firmly fixed, crafts beautiful. 7.5.6 Cabinet surface gauge, switch cabinet mark clear, neat, firm paste. 7.5.7 Terminal row of neat, is reliable, the appearance is clean and not damaged. 7.5.8 cables neat and clean, solid binding, binding process in appearance. 7.5.9 the first cable production firm, crafts beautiful, clear signage does not fade. 7.5.10 fireproof plugging tight, no cracks and pores. 7.6 7.6.1 of the standard electrical wiring quality technology cable a, the multi-core wire bunch arrangement should be parallel to each other, horizontal wire harness or wire should be perpendicular to the longitudinal multi-core wire bunch. The distance between the wire harness and wire harness symmetry, and as close as possible. B-core wiring harness into round, multi-core wire bunch used g wire binding, fastening 2 性最大的是 ( ) 7(已知平面直角坐标系中两点 (-1，O)、B(1，2)(连接AB，平移线段A8得到线段 ，AAB11若点A的对应点的坐标为(2，一1)，则B的对应点B的坐标为 ( ) A11A.(4，3) B(4，1) C(一2，3 ) D(一2，1) 8如图所示，某宾馆大厅要铺圆环形的地毯，工人师傅只测量了与小圆相切的大圆的弦AB的长，就计算出了圆环的面积。若测量得AB的长为20米，则圆环的面积为 ( ) A(10平方米 B(10平方米 ,OC(100平方米 D(100平方米 ,9(已知a、b、c是?ABC的三边长，且满足BA322322ABC，则?的形状是 a，ab，bc,b，ab，ac(第8题图)( ) A(等腰三角形 B(直角三角形 C(等腰三角形或直角三角形 D(等腰直角三角形 l10(已知?0的半径为l，圆心0 到直线l的距离为2，过上任一点A作?0的切线，切点为B，则线段AB长度的最小值为 ( ) 3A( 1 B( C( D(2 2二、填空题(本大题共8小题，每小题3分，共24分。不需写出解答过程，请把答案直接写在答题卡相应位置上) 2 2 211计算:sin30?+cos30?-2tan45?=_ . 22212(根据以下等式:，( 11,1212,123213,，,，,对于正整数n (n?4)，猜想:l+2+(n一1)+ n+(n一l)+2+1= . 112x，,x，,213.已知，则 . 2xx21xa,11x14.已知不等式组的解集是，则的值等于 . (a，1)(b,1),xb,23,15(随着电子技术的发展，手机价格不断降低，某品牌手机按原价降低元后，又降低20,，m此时售价为n元，则该手机原价为 元( 左视图主视图(第17题)16(如图，已知点A(1，1)，B(3，2)，且P为x轴上一动点，则?ABP周长的最小值为 . appearance of the weld appearance quality technical requirements of the project must not have a molten metal stream does not melt the base metal to weld, weld seam and heat-affected zone surface must not have cracks, pores, defects such as crater and ash, surface smoothing, weld and base metal should be evenly smooth transition. Width 2-3 mm from the edge of weld Groove. Surface reinforcement should be less than or equal to 1 + 0.2 times the slope edge width, and should not be greater than 4 mm. Depth of undercut should be less than or equal to 0.5 mm, total length of the welds on both sides undercut not exceed 10% of the weld length, and long continuous should not be greater than 100 mm. Wrong side should be less than or at 0.2T, and should not be greater than 2 mm (wall thickness mm t) incomplete or not allow 7.5 7.5.1 installation quality process standards of the electrical enclosure Cabinet surface is clean, neat, no significant phenomenon of convex, close to nature, close the door. 7.5.2 Cabinet Cabinet face paints no paint, returned to rusted, consistent color. 7.5.3 uniform indirect gap from top to bottom, slot width <1.5mm 7.5.4 adjacent Cabinet surface roughness is 0. 7.5.5 the cabinets firmly fixed, crafts beautiful. 7.5.6 Cabinet surface gauge, switch cabinet mark clear, neat, firm paste. 7.5.7 Terminal row of neat, is reliable, the appearance is clean and not damaged. 7.5.8 cables neat and clean, solid binding, binding process in appearance. 7.5.9 the first cable production firm, crafts beautiful, clear signage does not fade. 7.5.10 fireproof plugging tight, no cracks and pores. 7.6 7.6.1 of the standard electrical wiring quality technology cable a, the multi-core wire bunch arrangement should be parallel to each other, horizontal wire harness or wire should be perpendicular to the longitudinal multi-core wire bunch. The distance between the wire harness and wire harness symmetry, and as close as possible. B-core wiring harness into round, multi-core wire bunch used g wire binding, fastening 第3页 轻松中考数学网 www.qsgwsx.com 17(由几个相同小正方体搭成的几何体的主视图与左视图如图所示，则该几何体最少由 个小正方体搭成( 018(在四边形ABCD中，已知?ABC是等边三角形，?ADC=30，AD=3，BD=5，则边CD的长为 . 三、解答题(本大题共10小题，共66分。请在答题卡指定区域内作答，解答时应写出文字说明、证明过程或演算步骤) 6019(本题4分)计算: 3(1),，,22xy,3,xxyxy，20.(本题5分)已知、满足方程组，先将化简，再求值。yx,3814xy,xyxy,21(本题6分)如图所示，一艘轮船以30海里,小时的速度向正北方向航行，在A处测得0灯塔C在北偏西30方向，轮船航行2小时后到达B处，在B处时测得灯塔C在北偏西045方向(当轮船到达灯塔C的正东方向的D处时，求此时轮船与灯塔C的距离( 31.73,21.41,(结果精确到0(1海里，参考数据，) (第21题) 22(本题6分)小明参观上海世博会,由于仅有一天的时间,他上午从A一中国馆,B一韩国馆,E一英国馆,F一德国馆中日本馆,C一美国馆中任选一处参观,下午从D一任选一处参观, (1)请用画树状图或列表的方法,表示小明所有可能的参观方式(用字母表示), (2)求小明上午或下午至少参观一个亚洲国家馆的概率. appearance of the weld appearance quality technical requirements of the project must not have a molten metal stream does not me轻松中考数学网 www.qsgwsx.com lt the base metal to weld, weld seam and heat-affected zone surface must not have cracks, pores, defects such as crater and ash, surface smoothing, weld and base metal should be evenly smooth transition. Width 2-3 mm from the edge of weld Groove. Surface reinforcement should be less than or equal to 1 + 0.2 times the slope edge width, and should not be greater than 4 mm. Depth of undercut should be less than or equal to 0.5 mm, total length of the welds on both sides undercut not exceed 10% of the weld length, and long continuous should not be greater than 100 mm. Wrong side should be less than or at 0.2T, and should not be greater than 2 mm (wall thickness mm t) incomplete or not allow 7.5 7.5.1 installation quality process standards of the electrical enclosure Cabinet surface is clean, neat, no significant phenomenon of convex, close to nature, close the door. 7.5.2 Cabinet Cabinet face paints no paint, returned to rusted, consistent color. 7.5.3 uniform indirect gap from top to bottom, slot width <1.5mm 7.5.4 adjacent Cabinet surface roughness is 0. 7.5.5 the cabinets firmly fixed, crafts beautiful. 7.5.6 Cabinet surface gauge, switch cabinet mark clear, neat, firm paste. 7.5.7 Terminal row of neat, is reliable, the appearance is clean and not damaged. 7.5.8 cables neat and clean, solid binding, binding process in appearance. 7.5.9 the first cable production firm, crafts beautiful, clear signage does not fade. 7.5.10 fireproof plugging tight, no cracks and pores. 7.6 7.6.1 of the standard electrical wiring quality technology cable a, the multi-core wire bunch arrangement should be parallel to each other, horizontal wire harness or wire should be perpendicular to the longitudinal multi-core wire bunch. The distance between the wire harness and wire harness symmetry, and as close as possible. B-core wiring harness into round, multi-core wire bunch used g wire binding, fastening4 23. (本题7分)如图所示，制作一种产品的同时，需将原材料加热，设该材料温度为y?，从加热开始计算的时间为x分钟(据了解，该材料在加热过程中温度y与时间x成一次函数关系。已知该材料在加热前的温度为l5?，加热5分钟使材料温度达到60?时停止加热，停止加热后，材料温度逐渐下降，这时温度y与时问x成反比例函数关系( (1)分别求出该材料加热和停止加热过程中y与x的函数关系(要写出x的取值范); (2)根据工艺要求，在材料温度不低于30?的这段时间内，需要对该材料进行特殊处理，那么对该材料进行特殊处理所用的时间为多少分钟? x (第23题) 24(本题7分)某商店购进一批单价为8元的商品，如果按每件l0元出售，那么每天可销售100件。经调查发现，这种商品的销售单价每提高l元，其销售量相应减少l0件(将最大利润是多少, 销售价定为多少，才能使每天所获销售利润最大,1ABCDAAB25(本题7分)如图，是一张边DCAD21长为，边长为的矩形纸片，沿过BAA点的折痕将角翻折，使得点落在边,CDADEA上的点处，折痕交边于点. E,，DAE(1)求的大小; ,ABE(2)求?的面积. BA (第25题) 26(本题7分)甲、乙两学校都选派相同人数的学生参加数学竞赛，比赛结束后，发现每名参赛学生的成绩都是70分、80分、90分、l00分这四种成绩中的一种，并且甲、乙两校的学生获得100分的人数也相等(根据甲学校学生成绩的条形统计图和乙学校学生appearance of the weld appearance quality technical requirements of the project must not have a molten metal stream does not melt the base metal to weld, weld seam and heat-affected zone surface must not have cracks, pores, defects such as crater and ash, surface smoothing, weld and base metal should be evenly smooth transition. Width 2-3 mm from the edge of weld Groove. Surface reinforcement should be less than or equal to 1 + 0.2 times the slope edge width, and should not be greater than 4 mm. Depth of undercut should be less than or equal to 0.5 mm, total length of the welds on both sides undercut not exceed 10% of the weld length, and long continuous should not be greater than 100 mm. Wrong side should be less than or at 0.2T, and should not be greater than 2 mm (wall thickness mm t) incomplete or not allow 7.5 7.5.1 installation quality process standards of the electrical enclosure Cabinet surface is clean, neat, no significant phenomenon of convex, close to nature, close the door. 7.5.2 Cabinet Cabinet face paints no paint, returned to rusted, consistent color. 7.5.3 uniform indirect gap from top to bottom, slot width <1.5mm 7.5.4 adjacent Cabinet surface roughness is 0. 7.5.5 the cabinets firmly fixed, crafts beautiful. 7.5.6 Cabinet surface gauge, switch cabinet mark clear, neat, firm paste. 7.5.7 Terminal row of neat, is reliable, the appearance is clean and not damaged. 7.5.8 cables neat and clean, solid binding, binding process in appearance. 7.5.9 the first cable production firm, crafts beautiful, clear signage does not fade. 7.5.10 fireproof plugging tight, no cracks and pores. 7.6 7.6.1 of the standard electrical wiring quality technology cable a, the multi-core wire bunch arrangement should be parallel to each other, horizontal wire harness or wire should be perpendicular to the longitudinal multi-core wire bunch. The distance between the wire harness and wire harness symmetry, and as close as possible. B-core wiring harness into round, multi-core wire bunch used g wire binding, fastening 第5页 轻松中考数学网 www.qsgwsx.com 成绩的扇形统汁图回答下列问题( (1)求甲学校学生获得100分的人数; (2)分别求出甲、乙两学校学生这次数学竞赛所得分数的中位数和平均数，以此比较哪个学生这次数学竞赛成绩更好些( ( RtABCACBC 27.(本题9分)如图，?的两直角边边长为4，边长为3，它的内切圆BCACDAB为?0，?0与边、分别相切于点、COGFEAB、，延长交斜边于点( BO(1)求?的半径长; DG(2)求线段的长( DG O E AFC 第27题 b2,28(本题8分)二次函数:图象顶点的纵坐标不大于. yaxbxbab,，,(0,0)2(1)求该二次函数图象顶点的横坐标的取值范围; ABAB(2)若该二次函数图象与轴交于、两点，求线段长度的最小值( xappearance of the weld appearance quality technical requirements of the project must not have a molten metal stream does not me轻松中考数学网 www.qsgwsx.com lt the base metal to weld, weld seam and heat-affected zone surface must not have cracks, pores, defects such as crater and ash, surface smoothing, weld and base metal should be evenly smooth transition. Width 2-3 mm from the edge of weld Groove. Surface reinforcement should be less than or equal to 1 + 0.2 times the slope edge width, and should not be greater than 4 mm. Depth of undercut should be less than or equal to 0.5 mm, total length of the welds on both sides undercut not exceed 10% of the weld length, and long continuous should not be greater than 100 mm. Wrong side should be less than or at 0.2T, and should not be greater than 2 mm (wall thickness mm t) incomplete or not allow 7.5 7.5.1 installation quality process standards of the electrical enclosure Cabinet surface is clean, neat, no significant phenomenon of convex, close to nature, close the door. 7.5.2 Cabinet Cabinet face paints no paint, returned to rusted, consistent color. 7.5.3 uniform indirect gap from top to bottom, slot width <1.5mm 7.5.4 adjacent Cabinet surface roughness is 0. 7.5.5 the cabinets firmly fixed, crafts beautiful. 7.5.6 Cabinet surface gauge, switch cabinet mark clear, neat, firm paste. 7.5.7 Terminal row of neat, is reliable, the appearance is clean and not damaged. 7.5.8 cables neat and clean, solid binding, binding process in appearance. 7.5.9 the first cable production firm, crafts beautiful, clear signage does not fade. 7.5.10 fireproof plugging tight, no cracks and pores. 7.6 7.6.1 of the standard electrical wiring quality technology cable a, the multi-core wire bunch arrangement should be parallel to each other, horizontal wire harness or wire should be perpendicular to the longitudinal multi-core wire bunch. The distance between the wire harness and wire harness symmetry, and as close as possible. B-core wiring harness into round, multi-core wire bunch used g wire binding, fastening6 2011年大庆市初中升学统一考试 数学试题参考答案及评分标准 说明:本评分标准每小题都给出了一种或几种解法供参考，如果考生的解法与本题解答不同，参照本评分标准的精神给分。 一、选择题(每小题3分，共30分) 题号 1 2 3 4 5 6 7 8 9 10 答案 D C D D B A B D C C 二、填空题(每小题3分，共24分) 12,11(; l2(n; 13(2; l4(-6; 255，13nm，15(; 16.; l7(4; 18(4( 4三、解答题(共66分) ,，,31319(解:原式3分 ,14分 xy,3x,2,20.解:由的解是.2分 ,3814xy,y,1,2xxyxy，xxyxyxy()，,，则4分 ,，,xyxyy,xyxy,21,1.5分 ,1CDx,21.解:设 0RtBCDBDCDx,，,CBD45在?中，得1分 AB,，,30260ADx,，60又因为，所以 0RtACD，,CAD30在?中， appearance of the weld appearance quality technical requirements of the project must not have a molten metal stream does not melt the base metal to weld, weld seam and heat-affected zone surface must not have cracks, pores, defects such as crater and ash, surface smoothing, weld and base metal should be evenly smooth transition. Width 2-3 mm from the edge of weld Groove. Surface reinforcement should be less than or equal to 1 + 0.2 times the slope edge width, and should not be greater than 4 mm. Depth of undercut should be less than or equal to 0.5 mm, total length of the welds on both sides undercut not exceed 10% of the weld length, and long continuous should not be greater than 100 mm. Wrong side should be less than or at 0.2T, and should not be greater than 2 mm (wall thickness mm t) incomplete or not allow 7.5 7.5.1 installation quality process standards of